Answer:
no entiendo tu pregunta
What was Einstein Seeking?
Einstein was seeking a way to unify electromagnetism and gravity into a single theory.
After all the breakthroughs given by Einstein, he then worked on a " Grand Unified theory" for the last thirty of his life. He believed that all the forces of nature ( Electromagnetism and gravity were the only forces discovered at that time ) must be described by a single theory.
He failed to figure out a way to unify the forces of nature under a single theory. But physicists, even to this day are still working on the Grand Unified theory.
Therefore, Einstein was seeking a way to unify electromagnetism and gravity into a single theory.
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Do the following calculation and express the final answer in
proper scientific notation with the correct number of
significant digits:
(2.3 × 10^-3)(5.880 × 10^4) + 8.44
Answer:
x 10
I did the calculations and got 143.68. Since there’s multiplication I thought the number of sig figs would be 2 since 2.3 x 10^-3 has 2 sig figs. And I rounded the output to 14 and input 1.4 x 10^1 as the answer but got it wrong.
Answer:
Explanation:
I got the same thing. So, i don't know but good luck
The diagram below shows how sunlight is radiated back into the Earth's atmosphere as heat (infrared radiation).
A: Conduction
B:Coriolls Effect
C:The Greenhouse effect
D: The global warming effect
The diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.
The greenhouse effect is a natural phenomenon that occurs on Earth and heats up our atmosphere.
The name of this effect is derived from a greenhouse, which is used to grow crops in a special environment.
A greenhouse is basically a house that is made up of glass. The glass allows heat to enter the house but it does not allow the heat to escape to the outside thus keeping the greenhouse warm.
Some gases that are responsible for this effect are known as greenhouse gases. These gases are carbon dioxide, methane, chloro- fluoro carbons, etc.
These gases trap the heat of the sun and raise the temperature of Earth thus causing global warming.
Thus, the diagram that shows how sunlight is radiated back into the Earth’s atmosphere as heat(infrared radiation) is of the Greenhouse effect.
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What is the current in the 60.0 Q resistor? 120.0 V O A. 80.0 A B. 2.00 A O C. 1.50 A OD. 12.0 A 60.002 20.0 Q A
2A
Given ,
Resistance=60
V=12
V=IR
I=V/R
I=120/60=2A
The pace at which electrons flow past a location in a complete electrical circuit is defined as current. At its most fundamental, current Means flow.
An ampere (AM-pir), sometimes known as an amp, is the international unit for measuring current. It denotes the number of electrons (also known as "electrical charge") that pass across a location in a circuit over a specific time period.
A current of one ampere indicates that one coulomb of electrons—that is, 6.24 billion billion (6.24 x 1018) electrons—moves across a circuit in one second. The method is comparable to determining how many gallons move through a single spot in a pipe in one minute (gallons per minute, or GPM).
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What is the average velocity of a car that travels 12 kilometers in 0.20 hours?
Answer:
60 km/hr
Explanation:
Looking for km / hr
12 km / (.20 hr) = 60 km/hr
Chance drives her scooter 7 km north. She stops for lunch and then drives 5 km east. She spends 2 hours total. What her distance? displacement? average speed? average velocity?
We know that the distance is the difference between two points. The distance covered is a scalar quantity hence we can obtain the total speed algebraically. The displacement is a vector quantity hence we must obtain it geometrically.
Total distance = 7 km + 5 km = 12 km
Total displacement = √7^2 + 5^2 = 8.6 km East of North
Average speed = 12 km/ 2 hours = 6 Km/hr
Average velocity = 8.6 km East of North/2 hours = 4.3Km/hr East of North
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Is the suns gravitational pull on the earth the same at all seasosons of the year
No, the sun's gravitational pull is not same at all seasons of the year
The gravitational force between the Sun and Earth depends on the earth's distance from the sun and hence it varies over the course of a year. This is because the Earth’s orbit is an ellipse, bulged at the poles like an orange rather than a perfect circle. Earth’s average distance from the sun is approximately 150 million km , closest distance to the Sun is 146 million km, the largest distance is about is 152, so the distance varies by about 5.
The gravitational force between two bodies depends on their mass (how heavy they are) and their distance, and the distance changes according to the rotation an d revolution of the earth around the sun so the gravitational force also varies.
Earth revolves around the sun in its elliptical orbit and hence the force is balanced out due to certain factors and does not spiral out from its orbit. The change in gravitational force is balanced out due to certain factors such as change in speed of rotation and more and hence the gravitational pull on the earth is not the same .
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Mountain Dew is a mixture. Which of the following statements could be used to support the claim
that Mountain Dew is a mixture?
a. Mountain Dew is made of only one kind of element.
b. Mountain Dew is made of many elements that are all bonded together.
c. Mountain Dew is made of only one kind of molecule.
d. Mountain Dew is made of many substances that can be separated out.
Answer:
d. Mountain Dew is made of many substances that can be separated out.
We know that any mixture can be separated out into its individual components.
Normal temperature of human body is 98.6F while its atmosphere temperature is 84.6F what will be temperature of dead body in such atmosphere
A. 84.6F
B. 98.6F
C. 92.5F
D. 185F
Answer:
B. 98.6F is the temperature of dead body in 84.6F atmosphere.
Answer:
See below
Explanation:
After a while, the body will assume the temperature of its surroundings
and will be 84.6 degrees F
IMMEDIATLY after death the body will still be at 98.6 F ...but beginning to cool......
If a satellite orbiting Earth at an orbiting radius (r) has velocity (v). Which represents the velocity if the satellite is moved to an orbital radius or 4r?
If you can, give an explanation so I can learn it.
The velocity, if the satellite moves to an orbital radius of 4r is V/√4
We know that,
V = √ ( G M / r )
where,
V = Orbital velocity
G = Gravitational constant
M = Mass of the satellite
r = Radius of the orbit
Given that,
r' = 4r
V' = √ ( G M / r' )
V' = √ ( G M / 4r )
V' = ( 1 / √ 4 ) ( √ ( G M / r ) )
v' = v / √ 4
Orbital Velocity is the velocity at which one object revolves around another object in a orbit in uniform circular motion
Therefore, the velocity of the satellite that moved to an orbital radius of 4r is V/√4
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True or false. The planet's speed never changes. That is why we have a stable orbit.
O True
O False
Resistance between opposite faces of a unit cube. Expressed in ohm-centimeters or ohms per cubic centimeter.
Resistivity is the resistance between opposite faces of a unit cube.
The electrical resistance of a conductor with a unit cross-sectional area and unit length is called resistivity. Resistivity is a distinctive attribute of any material that may be used to compare different materials based on how well they conduct electric currents. Low conductivity is indicated by high resistance.
The Greek letter rho is frequently used to represent resistance, which is numerically equivalent to the resistance R of a wire-like specimen, multiplied by its cross-sectional area A, and divided by its length l; RA/l. The ohm is the measurement of resistance. Units of ohm-centimeter can be used to represent resistance when lengths are measured in centimeters. The temperature of the material also affects the value of resistivity.
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On a day when the wind is blowing toward the south at 3 m/s, a runner jogs west at 4 m/s. What is the speed of the
air relative to the runner?
[tex]{ \qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
Here we go ~
[tex]{\sf {V}_{w} } [/tex]= velocity of wind = 3 m/s (south) [tex]{\sf {V}_{r} } [/tex]= velocity of runner = 4 m/s (west)So,
[tex]{\sf {V}_{w} } [/tex] = - 3 [tex]{ \sf \hat{j}} [/tex][ taking unit vector along north be [tex]{ \sf \hat{j}} [/tex] ]
[tex]{\sf {V}_{r} } [/tex] = - 4 [tex]{ \sf \hat{i}} [/tex][ taking unit vector along west be [tex]{ \sf \hat{i}} [/tex] ]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= V_{w} - V_{r }[/tex]
[ where [tex]{ \sf V_{wr}= } [/tex] Relative velocity of wind with respect to runner ]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= - 3 \hat{ j} - ( - 4 \hat{i})[/tex]
[tex] \qquad \dashrightarrow\sf \: V_{wr}= - 3 \hat{ j} + 4 \hat{i}[/tex]
That is : 3 m/s towards south and 4 m/s towards east.
So, it makes an angle of 37° with south, and 53° with East.
[ The resultant is depicted by yellow arrow in attachment ]
Magnitude :[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{3 {}^{2} + 4 {}^{2} }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{9 + 16 }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = \sqrt{25 }[/tex]
[tex] \qquad \dashrightarrow\sf \: |V_{wr} | = 5 \: \: m/s[/tex]
Direction :[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{b\: \sin \theta}{b + a \sin( \theta) } [/tex]
[tex]{\sf \theta }[/tex] = angle between the two vectors ( along east and south) i.e 90°
b = 4 units[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4\: \sin (90 \degree)}{3+ 4 \cos( 90 \degree) } [/tex]
[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4 \times 1}{3+( 4 \times 0)} [/tex]
[tex] \dashrightarrow \sf \tan( \alpha) = \dfrac{4}{3} [/tex]
[tex] \dashrightarrow \sf \alpha = \tan {}^{ - 1} \bigg( \dfrac{4}{3 } \bigg)[/tex]
[tex] \dashrightarrow \sf \alpha = 53 \degree[/tex]
So, it's direction is 53° east from south ~
A yellow-gold object has a mass of 57.9 g and its volume is 3 cm³. Could the object be made of gold?
Density of gold: 19.3 g/cm³
Yes, the object is made of gold if the yellow object has a mass of 57.9 g and its volume is 3 [tex]cm^{3}[/tex].
Mass of object = 57.9 g
Volume of object = 3 [tex]cm^{3}[/tex]
Also, given density of gold: 19.3 g/[tex]cm^{3}[/tex]
We know that, Density = Mass/Volume
= 57.9/3
=19.3 g/[tex]cm^{3}[/tex]
So we calculated the density from the given data in question.
As the density of gold and the given yellow object is same we can conclude that the object is made of Gold.
It is yellow too which is a property of gold and the density is same as well.
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You want to average 90 km/h on a car trip. You cover the first half of the distance at an
average speed of 48 km/h.
a) What average speed must you have for the second half of the trip to meet your goal?
b) Is this reasonable? Note that the velocities are based on half the distance, not half the
time.
(a) The average speed must you have for the second half of the trip to meet your goal is 8 km/h.
(b) The value obtained (8 km/h) is not reasonable for the second half of the distance since the first half is 48km/h.
What is average velocity?
Average velocity is defined as the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs.
average velocity = total distance / total time
v = (d)/(0.5d/v₁ + 0.5d/v₂)
where;
v is the average velocityv₁ is the average velocity during the first halfv₂ is the average velocity during the second half90 km/h = (d) / (0.5d/48 + 0.5d/v₂)
90(0.5d/48 + 0.5d/v₂) = d
0.9375d + 0.5d/v₂ = d
d(0.9375 + 0.5/v₂) = d
0.9375 + 0.5/v₂ = 1
0.5/v₂ = 0.0625
v₂ = 0.5/0.0625
v₂ = 8 km/h
Thus, the average speed must you have for the second half of the trip to meet your goal is 8 km/h.
The value obtained (8 km/h) is not reasonable for the second half of the distance since the first half is 48km/h.
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I)Graphite and iodine are non-metals but they shine. Explain it with suitable non metal reasons.
Answer: Graphite and iodine are non-metals that have lustre.
Explanation:
Graphite is a non-metal which has metallic luster. Metallic lustre is due to presence of free electrons in them, generally non metals don't exhibit this property, but iodine and graphite are non metals they exhibit metallic lustre.
One afternoon, a couple walks three-fourths of the way around a circular lake, the radius of which is 2.97 km. They start at the west side of the lake and head due south to begin with. (a) What is the distance they travel? (b) What is the magnitude of the couple’s displacement? (c) What is the direction (relative to due east) of the couple’s displacement?
The distance they travel is 4.85 km. the magnitude of the couple’s displacement is 1.456 km. The displacement vector is 315 degrees counterclockwise in relation to the east.
The total distance traveled is the overall distance traveled during the entire excursion. However, the displacement is the net distance traveled between the starting location and the final position. Displacement cannot exceed distance in any way. An element of a vector is the displacement. It is a scalar quantity, the distance.
The couple circles a circular lake on foot about 3/4 of the way.
The circle has a radius of r = 1.03 km, or 1030 meters.
The couple's journey begins at point A and ends at point D by taking the path ABCD.
The journey's distance is calculated as follows:
d = 0.75*2*3.14*1.03*d
=4.85 km
The net distance between points A and D is the displacement's magnitude. |d| = |AD|=|r2+r2
= 21.03/2
=1.456 km
The displacement vector is 315 degrees counterclockwise in relation to the east.
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A stunt man drops from a building and falls 15m down onto a giant air mattress
sketch
A) How much time does it take for the stunt man to hit the air mattress?
B) What is his velocity as he slams into the mattress (# and direction)?
PLEASE HELP!!! ASAP
A. The time taken for the stunt man to hit the mattress is 1.75 s
B. The velocity the stunt man as he slams into the mattress is 17.15 m/s
A. How to determine the time taken to hit the mattressHeight (h) = 15 mAcceleration due to gravity (g) = 9.8 m/s²Time (t) =?h = ½gt²
15 = ½ × 9.8 × t²
15 = 4.9 × t²
Divide both side by 4.9
t² = 15 / 4.9
Take the square root of both side
t = √(15 / 4.9)
t = 1.75 s
Thus, it will take the stunt man 1.75 s to hit the mattress
B. How to determine the velocityAcceleration due to gravity (g) = 9.8 m/s²Time (t) = 1.75 sVelocity (v) =?v = gt
v = 9.8 × 1.75
v = 17.15 m/s
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The kilowatt -hour (kWh) is a much larger unit of energy than the joule. There are 3.6×10^6J in a kWh. The kWh is convenient for electrical appliances. a) What is the energy used in operating a 1200W heater for 20 minutes?
The correct answer is 144 KJ .
Work power, or simply power, is referred to as a physical notion that, depending on the situation and the information at hand, may have a variety of interpretations. The rate of performing labour is referred to as power. Power is defined as the amount of energy used per unit of time. Since it lacks a direction, it is present in scalar amount. Joules/second, or Watt in the SI system, is the unit of power. A watt is the amount of energy required to perform one joule of work in a second.
P = 120 Watts of power
20 minutes plus 60 seconds equals 1200 seconds.
taken t and Energy E= Power P x Time t.
= Work W (or Energy E)/Time
since we know that Power P
Energy E= 120 W x 1200 = 144000 J or 144 KJ
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A weight is suspended motionless from a bar which hangs from the ceiling by two ropes. The
weight has 25 N of gravitational force pulling on it. A free-body diagram for this situation looks
like this:
Answer: a weight of 25n
Explanation:4+5
An ant is crawling along a yardstick that is pointed with the 0-inch mark to the east and the 36-inch mark to the west. It starts at the 17-inch mark, crawls to the 21-inch mark, then moves to the 8-inch mark. What was the total distance the ant traveled?
The total distance that is traveled is 12 inches.
What is the distance?We know that distance is a scalar quantity. The term distance only has to do with the difference between two points. The direction is not taken into cognizance when we are discussing the distance that has been covered.
As we have said that distance is a scalar quantity, it the follows that the process of obtaining the total distance can only be algebraic given that we could directly add all the distance covered by the ant in order to obtain the total distance of the ant.
Now, we can see that the ant starts at the 17-inch mark, crawls to the 21-inch mark, then moves to the 8-inch mark. The total distance covered is obtained from; (21 - 17) + 8 = 12 inches.
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A string applies an upward (tension) force of 34 N to lift a bucket of mass 2.8 kg. What is
the acceleration of the bucket? (Answer in m/s²)
The acceleration of the bucket of mass 2.8 kg which is lifted upwards with a force of 34 N is 12.14 m / s²
According to Newton's second law of motion,
F = m a
F = Force
m = Mass
a = Acceleration
F = 34 N
m = 2.8 kg
a = F / m
a = 34 / 2.8
a = 12.14 m / s²
Acceleration is the rate of change of velocity of an object with respect to time. It is denoted as a.
Therefore, the acceleration of the bucket is 12.14 m / s²
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1. What is the temperature in Celsius, If the Fahrenheit was 57.98 Farenheit?
Answer:
57.98 °Fahrenheit =
14.4333 °Celsius
Explanation:
(rounded to 6 digits)
76. Two electric charges -6μC and
+6μC are placed respectively in two
points A and B distant of 1m apart. The
electric field is null at the point C:
A.Located in the middle of the
segment AB
B.Located outside segment AB at
1m from A.
C.Located outside segment AB at
1m from B
D.Outside the line AB
E.No answer is right.
Answer:
D. Located outside line AB
Explanation:
I do not have a Columb table with me, so it could be B. or C., but if I did the math right, then I think the answer is D.
You drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20
min.
What is your VELOCITY in m/s?
0m/s
-9 m/s
-3 m/s
+4 m/s
Answer:
+4m/s
Explanation:
You drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20 min, then velocity is 4 m/s.
What is velocity?When an item is moving, its velocity is the rate at which its direction is changing as seen from a certain point of view and as measured by a specific unit of time.
Uniform motion an object is said to have uniform motion when object cover equal distance in equal interval of time within exact fixed direction. For a body in uniform motion, the magnitude of its velocity remains constant over time.
Given in the question you drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20 min.
The velocity in m/sec is given as 4 m/s.
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Which change to an object would reduce its kinetic energy by half?
A. Reducing its mass to one-quarter of its original value
B. Reducing its mass to one-half of its original value
C. Increasing its velocity to twice its original value
D. Increasing its velocity to four times its original value
SUBMI
A. Reducing its mass to one-quarter of its original value; will reduce the kinetic energy of the object by half.
Kinetic energy is a type of power that a moving object or particle possesses. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. A moving object or particle has kinetic energy, which depends on both its mass and its rate of motion. The type of motion can be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.
A body's translational kinetic energy is equal to half of the product of its mass, m, and its velocity, sq,v,
The formula of kinetic energy = 1/2 x mv^2
Since it is based on the mass of the object, the kinetic energy also gets reduced by half along with the mass.
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d = 250 g/cm³ V = ? m = 1000 g
The volume is 4cm³.
The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol ρ.The density is 250g/cm³.Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull on other bodies is also influenced by its mass. The kilogramme serves as the SI's fundamental mass unit.The mass is 1000g.density = mass/volumeVolume is a measurement of three-dimensional space that is occupied. It is frequently expressed mathematically using imperial or SI-derived units.volume = mass/densityvolume = 1000/250volume = 4cm³To learn more about density, visit :
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An 8kg bullet is shot into a 4kg block , at rest on a frictionless horizontal surface . The bullet remains lodged in the block.The block moves into an ideal massless spring and compresses it by 8, 7cm. The spring constant of the spring is 2400n/m.What is the initial speed of the bullet?
By applying the law of conservation of energy, the initial speed of this bullet is equal to 1.8456 m/s.
Given the following data:
Mass of the bullet, m₁ = 8 kgMass of the block, m₂ = 4 kg.Initial speed of block = 0 m/s (since it's at rest).Compression in the spring, x = 8.7 cm to m = 8.7 × 10 mSpring constant, k = 2400 N/m.How to calculate initial speed of the bullet?First of all, we would apply the law of conservation of momentum to derive an expression for the final velocity of both objects (bullet and block):
m₁u₁ + m₂u₂ = (m₁ + m₂)v
m₁u₁ + 0 = (m₁ + m₂)v
m₁u₁ = (m₁ + m₂)v
v = m₁u₁/(m₁ + m₂)
In order to calculate the initial speed of this bullet, we would also apply the law of conservation of energy:
K.E = U
1/2 × (m₁ + m₂)v² = 1/2kx²
Substituting the value of v, we have:
(m₁ + m₂)[m₁u₁/(m₁ + m₂)]² = kx²
m₁²u₁²/(m₁ + m₂) = kx²
m₁²u₁² = (m₁ + m₂)kx²
u₁² = [(m₁ + m₂)kx²]/m₁²
u₁ = √([(m₁ + m₂)kx²]/m₁²)
u₁ = √([(8 + 4) × 2400 × 0.087²]/8²)
u₁ = √([12 × 2400 × 0.007569]/64)
u₁ = √217.9872/64
u₁ = √3.4061
Initial speed, u₁ = 1.8456 m/s.
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Example 2 (5 points) Researchers at a university want to know if higher levels of nitrogen in fertilizer will increase the production of tomatoes per plant. Twenty plants are given normal levels of nitrogen and twenty other plants are given ten percent higher levels throughout the growing season. The plants receive the same levels of sunlight, water and are planted in the same soil on one farm. At the end of the experiment the average number of tomatoes produced is the same for each group. The scientists repeat the experiment on two additional farms further south that season. The researchers conclude that increasing nitrogen levels by 10% in tomatoes is not beneficial. Would this be a well-designed reliable experiment? Support your decision with at least three reasons.
The experiment was well designed.
What is an experiment?An experiment is used to determine cause and effect relationships. We know that in this case, the research is aimed at being able to obtain the relationship that exists between the amount of nitrogen in the soil and the production of tomatoes per plant.
As we could see, the experiment includes a control that serves as a baseline for determining the validity of the results. Further more, the sunlight, water and soil were held constant. The experiment was even repeated further south to verify the results.
Based on a careful review of the experiment, the experiment was well designed.
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does distance have direction? does displacement have direction?
Answer:
Below
Explanation:
Distance is considered a scalar measurement, meaning it does not have direction associated with it.
Displacement is a vector measurement. This means that direction is important and changes the value depending on which way it goes